Patents by Inventor Susumu Hironaka

Susumu Hironaka has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Fiber reinforced plastic golf shaft
    Patent number: 7037212
    Abstract: A golf shaft made of fiber reinforced plastic and including a tip portion attached to a head, a butt portion attached to a grip, and a middle portion located between the tip portion and the butt portion. The golf shaft has a generally tapered shape in which the outer diameter generally increases gradually from the tip portion to the butt portion. The golf shaft includes a first portion in which linear density is generally uniform. A second portion is defined by the part of the shaft excluding the first portion. The first portion occupies 30% or more of the entire shaft length, and the linear density of the first portion is greater than that of the linear density.
    Type: Grant
    Filed: March 31, 2004
    Date of Patent: May 2, 2006
    Assignee: Mizuno Corporation
    Inventors: Hiroki Ashida, Takashi Ishii, Susumu Hironaka
  • Fiber reinforced plastic golf shaft
    Publication number: 20040192462
    Abstract: A golf shaft made of fiber reinforced plastic and including a tip portion attached to a head, a butt portion attached to a grip, and a middle portion located between the tip portion and the butt portion. The golf shaft has a generally tapered shape in which the outer diameter generally increases gradually from the tip portion to the butt portion. The golf shaft includes a first portion in which linear density is generally uniform. A second portion is defined by the part of the shaft excluding the first portion. The first portion occupies 30% or more of the entire shaft length, and the linear density of the first portion is greater than that of the linear density.
    Type: Application
    Filed: March 31, 2004
    Publication date: September 30, 2004
    Applicants: Mizuno Corporation, Mizuno Technics Corporation
    Inventors: Hiroki Ashida, Takashi Ishii, Susumu Hironaka